CNTK/Source/Math/Helpers.h

//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.md file in the project root for full license information.
//
// helpful macros
// TODO: the file's name is too general to be included from outside; MathHelpers.h?

#pragma once

// iterators
#undef foreach_row
#undef foreach_column
#undef foreach_coord
#undef foreach_row_in_submat
#define foreach_row(_i, _m) for (long _i = 0; _i < (_m).GetNumRows(); _i++)
#define foreach_column(_j, _m) for (long _j = 0; _j < (_m).GetNumCols(); _j++)
#define foreach_coord(_i, _j, _m)                   \
    for (long _j = 0; _j < (_m).GetNumCols(); _j++) \
        for (long _i = 0; _i < (_m).GetNumRows(); _i++)
#define foreach_row_in_submat(_i, _istart, _iend, _m) for (long _i = _istart; _i < min(_iend, (_m).GetNumRows()); _i++)

// this functions returns the index of the first column element in the columnwise array representing matrix with _numRows rows
#define column_s_ind_colwisem(_colNum, _numRows) ((_numRows) * (_colNum))